Feynman. Von Neumann. Teller. Ulam. (At least, they all seem pretty non-mystical from what I know of them; I am willing to be corrected by others who know more

Feynman. Von Neumann. Teller. Ulam. (At least, they all seem pretty non-mystical from what I know of them; I am willing to be corrected by others who know more about their lives and minds.)